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Capital Management (Tables)
 12 Months Ended
Dec. 31, 2020
Corporate Information And Statement Of IFRS Compliance [Abstract]  
Capital management information It is reconciled to the nearest measure determined in accordance with IFRS, cash flow from operating activities, as set forth below.
Years Ended December 31
20202019
Cash flow from operating activities$353,096 $834,939 
Change in non-cash working capital(48,758)52,070 
Asset retirement obligations settled7,168 15,417 
Adjusted funds flow$311,506 $902,426 
The computation of net debt is set forth below.
December 31, 2020December 31, 2019
Credit facilities - principal$651,173 $506,471 
Long-term notes - principal1,147,950 1,337,200 
Trade and other payables155,955 207,454 
Cash— (5,572)
Trade and other receivables(107,477)(173,762)
Net debt$1,847,601 $1,871,791